### Home > ACC7 > Chapter 8 Unit 5 > Lesson CC2: 8.3.3 > Problem8-86

8-86.

Use a straightedge to draw a triangle on your paper.

1. Estimate the measure of each angle in your triangle and label it.

An acute angle measures less than $90°$. A right angle measures $90°$. An angle measuring more than $90°$ but less than $180°$ is obtuse.

2. Add your three estimated angle measures. What do you notice? Do you need to change any of your estimates?

The measures of the three angles of a triangle should add up to $180°$. Do your angle estimates follow this rule?